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1071 lines
28 KiB
1071 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Basic Node interface support |
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*/ |
|
|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/memory.h> |
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#include <linux/vmstat.h> |
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#include <linux/notifier.h> |
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#include <linux/node.h> |
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#include <linux/hugetlb.h> |
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#include <linux/compaction.h> |
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#include <linux/cpumask.h> |
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#include <linux/topology.h> |
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#include <linux/nodemask.h> |
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#include <linux/cpu.h> |
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#include <linux/device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/swap.h> |
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#include <linux/slab.h> |
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|
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static struct bus_type node_subsys = { |
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.name = "node", |
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.dev_name = "node", |
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}; |
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|
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|
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static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf) |
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{ |
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ssize_t n; |
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cpumask_var_t mask; |
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struct node *node_dev = to_node(dev); |
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|
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/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
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BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); |
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|
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if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
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return 0; |
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|
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cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask); |
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n = cpumap_print_to_pagebuf(list, buf, mask); |
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free_cpumask_var(mask); |
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|
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return n; |
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} |
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|
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static inline ssize_t cpumap_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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return node_read_cpumap(dev, false, buf); |
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} |
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|
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static DEVICE_ATTR_RO(cpumap); |
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|
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static inline ssize_t cpulist_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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return node_read_cpumap(dev, true, buf); |
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} |
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|
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static DEVICE_ATTR_RO(cpulist); |
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|
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/** |
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* struct node_access_nodes - Access class device to hold user visible |
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* relationships to other nodes. |
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* @dev: Device for this memory access class |
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* @list_node: List element in the node's access list |
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* @access: The access class rank |
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* @hmem_attrs: Heterogeneous memory performance attributes |
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*/ |
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struct node_access_nodes { |
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struct device dev; |
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struct list_head list_node; |
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unsigned access; |
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#ifdef CONFIG_HMEM_REPORTING |
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struct node_hmem_attrs hmem_attrs; |
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#endif |
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}; |
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#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev) |
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|
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static struct attribute *node_init_access_node_attrs[] = { |
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NULL, |
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}; |
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|
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static struct attribute *node_targ_access_node_attrs[] = { |
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NULL, |
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}; |
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|
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static const struct attribute_group initiators = { |
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.name = "initiators", |
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.attrs = node_init_access_node_attrs, |
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}; |
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|
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static const struct attribute_group targets = { |
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.name = "targets", |
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.attrs = node_targ_access_node_attrs, |
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}; |
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|
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static const struct attribute_group *node_access_node_groups[] = { |
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&initiators, |
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&targets, |
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NULL, |
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}; |
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|
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static void node_remove_accesses(struct node *node) |
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{ |
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struct node_access_nodes *c, *cnext; |
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|
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list_for_each_entry_safe(c, cnext, &node->access_list, list_node) { |
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list_del(&c->list_node); |
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device_unregister(&c->dev); |
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} |
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} |
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|
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static void node_access_release(struct device *dev) |
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{ |
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kfree(to_access_nodes(dev)); |
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} |
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|
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static struct node_access_nodes *node_init_node_access(struct node *node, |
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unsigned access) |
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{ |
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struct node_access_nodes *access_node; |
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struct device *dev; |
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|
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list_for_each_entry(access_node, &node->access_list, list_node) |
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if (access_node->access == access) |
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return access_node; |
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|
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access_node = kzalloc(sizeof(*access_node), GFP_KERNEL); |
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if (!access_node) |
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return NULL; |
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|
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access_node->access = access; |
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dev = &access_node->dev; |
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dev->parent = &node->dev; |
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dev->release = node_access_release; |
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dev->groups = node_access_node_groups; |
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if (dev_set_name(dev, "access%u", access)) |
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goto free; |
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|
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if (device_register(dev)) |
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goto free_name; |
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|
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pm_runtime_no_callbacks(dev); |
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list_add_tail(&access_node->list_node, &node->access_list); |
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return access_node; |
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free_name: |
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kfree_const(dev->kobj.name); |
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free: |
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kfree(access_node); |
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return NULL; |
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} |
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|
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#ifdef CONFIG_HMEM_REPORTING |
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#define ACCESS_ATTR(name) \ |
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static ssize_t name##_show(struct device *dev, \ |
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struct device_attribute *attr, \ |
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char *buf) \ |
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{ \ |
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return sysfs_emit(buf, "%u\n", \ |
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to_access_nodes(dev)->hmem_attrs.name); \ |
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} \ |
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static DEVICE_ATTR_RO(name) |
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|
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ACCESS_ATTR(read_bandwidth); |
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ACCESS_ATTR(read_latency); |
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ACCESS_ATTR(write_bandwidth); |
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ACCESS_ATTR(write_latency); |
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|
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static struct attribute *access_attrs[] = { |
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&dev_attr_read_bandwidth.attr, |
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&dev_attr_read_latency.attr, |
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&dev_attr_write_bandwidth.attr, |
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&dev_attr_write_latency.attr, |
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NULL, |
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}; |
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|
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/** |
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* node_set_perf_attrs - Set the performance values for given access class |
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* @nid: Node identifier to be set |
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* @hmem_attrs: Heterogeneous memory performance attributes |
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* @access: The access class the for the given attributes |
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*/ |
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void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs, |
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unsigned access) |
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{ |
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struct node_access_nodes *c; |
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struct node *node; |
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int i; |
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|
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if (WARN_ON_ONCE(!node_online(nid))) |
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return; |
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|
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node = node_devices[nid]; |
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c = node_init_node_access(node, access); |
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if (!c) |
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return; |
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|
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c->hmem_attrs = *hmem_attrs; |
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for (i = 0; access_attrs[i] != NULL; i++) { |
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if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i], |
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"initiators")) { |
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pr_info("failed to add performance attribute to node %d\n", |
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nid); |
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break; |
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} |
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} |
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} |
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|
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/** |
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* struct node_cache_info - Internal tracking for memory node caches |
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* @dev: Device represeting the cache level |
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* @node: List element for tracking in the node |
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* @cache_attrs:Attributes for this cache level |
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*/ |
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struct node_cache_info { |
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struct device dev; |
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struct list_head node; |
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struct node_cache_attrs cache_attrs; |
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}; |
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#define to_cache_info(device) container_of(device, struct node_cache_info, dev) |
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|
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#define CACHE_ATTR(name, fmt) \ |
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static ssize_t name##_show(struct device *dev, \ |
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struct device_attribute *attr, \ |
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char *buf) \ |
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{ \ |
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return sysfs_emit(buf, fmt "\n", \ |
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to_cache_info(dev)->cache_attrs.name); \ |
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} \ |
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DEVICE_ATTR_RO(name); |
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|
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CACHE_ATTR(size, "%llu") |
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CACHE_ATTR(line_size, "%u") |
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CACHE_ATTR(indexing, "%u") |
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CACHE_ATTR(write_policy, "%u") |
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|
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static struct attribute *cache_attrs[] = { |
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&dev_attr_indexing.attr, |
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&dev_attr_size.attr, |
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&dev_attr_line_size.attr, |
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&dev_attr_write_policy.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(cache); |
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|
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static void node_cache_release(struct device *dev) |
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{ |
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kfree(dev); |
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} |
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static void node_cacheinfo_release(struct device *dev) |
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{ |
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struct node_cache_info *info = to_cache_info(dev); |
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kfree(info); |
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} |
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|
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static void node_init_cache_dev(struct node *node) |
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{ |
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struct device *dev; |
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|
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dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
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if (!dev) |
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return; |
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|
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device_initialize(dev); |
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dev->parent = &node->dev; |
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dev->release = node_cache_release; |
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if (dev_set_name(dev, "memory_side_cache")) |
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goto put_device; |
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if (device_add(dev)) |
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goto put_device; |
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pm_runtime_no_callbacks(dev); |
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node->cache_dev = dev; |
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return; |
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put_device: |
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put_device(dev); |
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} |
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|
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/** |
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* node_add_cache() - add cache attribute to a memory node |
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* @nid: Node identifier that has new cache attributes |
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* @cache_attrs: Attributes for the cache being added |
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*/ |
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void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs) |
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{ |
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struct node_cache_info *info; |
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struct device *dev; |
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struct node *node; |
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|
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if (!node_online(nid) || !node_devices[nid]) |
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return; |
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node = node_devices[nid]; |
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list_for_each_entry(info, &node->cache_attrs, node) { |
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if (info->cache_attrs.level == cache_attrs->level) { |
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dev_warn(&node->dev, |
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"attempt to add duplicate cache level:%d\n", |
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cache_attrs->level); |
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return; |
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} |
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} |
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if (!node->cache_dev) |
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node_init_cache_dev(node); |
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if (!node->cache_dev) |
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return; |
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info = kzalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return; |
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dev = &info->dev; |
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device_initialize(dev); |
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dev->parent = node->cache_dev; |
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dev->release = node_cacheinfo_release; |
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dev->groups = cache_groups; |
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if (dev_set_name(dev, "index%d", cache_attrs->level)) |
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goto put_device; |
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info->cache_attrs = *cache_attrs; |
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if (device_add(dev)) { |
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dev_warn(&node->dev, "failed to add cache level:%d\n", |
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cache_attrs->level); |
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goto put_device; |
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} |
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pm_runtime_no_callbacks(dev); |
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list_add_tail(&info->node, &node->cache_attrs); |
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return; |
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put_device: |
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put_device(dev); |
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} |
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static void node_remove_caches(struct node *node) |
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{ |
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struct node_cache_info *info, *next; |
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|
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if (!node->cache_dev) |
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return; |
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list_for_each_entry_safe(info, next, &node->cache_attrs, node) { |
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list_del(&info->node); |
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device_unregister(&info->dev); |
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} |
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device_unregister(node->cache_dev); |
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} |
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static void node_init_caches(unsigned int nid) |
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{ |
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INIT_LIST_HEAD(&node_devices[nid]->cache_attrs); |
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} |
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#else |
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static void node_init_caches(unsigned int nid) { } |
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static void node_remove_caches(struct node *node) { } |
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#endif |
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#define K(x) ((x) << (PAGE_SHIFT - 10)) |
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static ssize_t node_read_meminfo(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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int len = 0; |
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int nid = dev->id; |
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struct pglist_data *pgdat = NODE_DATA(nid); |
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struct sysinfo i; |
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unsigned long sreclaimable, sunreclaimable; |
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unsigned long swapcached = 0; |
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|
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si_meminfo_node(&i, nid); |
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sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B); |
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sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B); |
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#ifdef CONFIG_SWAP |
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swapcached = node_page_state_pages(pgdat, NR_SWAPCACHE); |
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#endif |
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len = sysfs_emit_at(buf, len, |
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"Node %d MemTotal: %8lu kB\n" |
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"Node %d MemFree: %8lu kB\n" |
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"Node %d MemUsed: %8lu kB\n" |
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"Node %d SwapCached: %8lu kB\n" |
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"Node %d Active: %8lu kB\n" |
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"Node %d Inactive: %8lu kB\n" |
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"Node %d Active(anon): %8lu kB\n" |
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"Node %d Inactive(anon): %8lu kB\n" |
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"Node %d Active(file): %8lu kB\n" |
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"Node %d Inactive(file): %8lu kB\n" |
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"Node %d Unevictable: %8lu kB\n" |
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"Node %d Mlocked: %8lu kB\n", |
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nid, K(i.totalram), |
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nid, K(i.freeram), |
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nid, K(i.totalram - i.freeram), |
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nid, K(swapcached), |
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nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + |
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node_page_state(pgdat, NR_ACTIVE_FILE)), |
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nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + |
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node_page_state(pgdat, NR_INACTIVE_FILE)), |
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nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), |
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nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), |
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nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), |
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nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), |
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nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), |
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nid, K(sum_zone_node_page_state(nid, NR_MLOCK))); |
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|
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#ifdef CONFIG_HIGHMEM |
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len += sysfs_emit_at(buf, len, |
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"Node %d HighTotal: %8lu kB\n" |
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"Node %d HighFree: %8lu kB\n" |
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"Node %d LowTotal: %8lu kB\n" |
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"Node %d LowFree: %8lu kB\n", |
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nid, K(i.totalhigh), |
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nid, K(i.freehigh), |
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nid, K(i.totalram - i.totalhigh), |
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nid, K(i.freeram - i.freehigh)); |
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#endif |
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len += sysfs_emit_at(buf, len, |
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"Node %d Dirty: %8lu kB\n" |
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"Node %d Writeback: %8lu kB\n" |
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"Node %d FilePages: %8lu kB\n" |
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"Node %d Mapped: %8lu kB\n" |
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"Node %d AnonPages: %8lu kB\n" |
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"Node %d Shmem: %8lu kB\n" |
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"Node %d KernelStack: %8lu kB\n" |
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#ifdef CONFIG_SHADOW_CALL_STACK |
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"Node %d ShadowCallStack:%8lu kB\n" |
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#endif |
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"Node %d PageTables: %8lu kB\n" |
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"Node %d NFS_Unstable: %8lu kB\n" |
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"Node %d Bounce: %8lu kB\n" |
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"Node %d WritebackTmp: %8lu kB\n" |
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"Node %d KReclaimable: %8lu kB\n" |
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"Node %d Slab: %8lu kB\n" |
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"Node %d SReclaimable: %8lu kB\n" |
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"Node %d SUnreclaim: %8lu kB\n" |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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"Node %d AnonHugePages: %8lu kB\n" |
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"Node %d ShmemHugePages: %8lu kB\n" |
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"Node %d ShmemPmdMapped: %8lu kB\n" |
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"Node %d FileHugePages: %8lu kB\n" |
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"Node %d FilePmdMapped: %8lu kB\n" |
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#endif |
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, |
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nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), |
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nid, K(node_page_state(pgdat, NR_WRITEBACK)), |
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nid, K(node_page_state(pgdat, NR_FILE_PAGES)), |
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nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), |
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nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), |
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nid, K(i.sharedram), |
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nid, node_page_state(pgdat, NR_KERNEL_STACK_KB), |
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#ifdef CONFIG_SHADOW_CALL_STACK |
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nid, node_page_state(pgdat, NR_KERNEL_SCS_KB), |
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#endif |
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nid, K(node_page_state(pgdat, NR_PAGETABLE)), |
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nid, 0UL, |
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nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)), |
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nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), |
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nid, K(sreclaimable + |
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node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)), |
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nid, K(sreclaimable + sunreclaimable), |
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nid, K(sreclaimable), |
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nid, K(sunreclaimable) |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
, |
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nid, K(node_page_state(pgdat, NR_ANON_THPS)), |
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nid, K(node_page_state(pgdat, NR_SHMEM_THPS)), |
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nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)), |
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nid, K(node_page_state(pgdat, NR_FILE_THPS)), |
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nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED)) |
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#endif |
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); |
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len += hugetlb_report_node_meminfo(buf, len, nid); |
|
return len; |
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} |
|
|
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#undef K |
|
static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL); |
|
|
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static ssize_t node_read_numastat(struct device *dev, |
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struct device_attribute *attr, char *buf) |
|
{ |
|
return sysfs_emit(buf, |
|
"numa_hit %lu\n" |
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"numa_miss %lu\n" |
|
"numa_foreign %lu\n" |
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"interleave_hit %lu\n" |
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"local_node %lu\n" |
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"other_node %lu\n", |
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sum_zone_numa_state(dev->id, NUMA_HIT), |
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sum_zone_numa_state(dev->id, NUMA_MISS), |
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sum_zone_numa_state(dev->id, NUMA_FOREIGN), |
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sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT), |
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sum_zone_numa_state(dev->id, NUMA_LOCAL), |
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sum_zone_numa_state(dev->id, NUMA_OTHER)); |
|
} |
|
static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL); |
|
|
|
static ssize_t node_read_vmstat(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
int nid = dev->id; |
|
struct pglist_data *pgdat = NODE_DATA(nid); |
|
int i; |
|
int len = 0; |
|
|
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
|
len += sysfs_emit_at(buf, len, "%s %lu\n", |
|
zone_stat_name(i), |
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sum_zone_node_page_state(nid, i)); |
|
|
|
#ifdef CONFIG_NUMA |
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for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++) |
|
len += sysfs_emit_at(buf, len, "%s %lu\n", |
|
numa_stat_name(i), |
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sum_zone_numa_state(nid, i)); |
|
|
|
#endif |
|
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) { |
|
unsigned long pages = node_page_state_pages(pgdat, i); |
|
|
|
if (vmstat_item_print_in_thp(i)) |
|
pages /= HPAGE_PMD_NR; |
|
len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i), |
|
pages); |
|
} |
|
|
|
return len; |
|
} |
|
static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL); |
|
|
|
static ssize_t node_read_distance(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
int nid = dev->id; |
|
int len = 0; |
|
int i; |
|
|
|
/* |
|
* buf is currently PAGE_SIZE in length and each node needs 4 chars |
|
* at the most (distance + space or newline). |
|
*/ |
|
BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); |
|
|
|
for_each_online_node(i) { |
|
len += sysfs_emit_at(buf, len, "%s%d", |
|
i ? " " : "", node_distance(nid, i)); |
|
} |
|
|
|
len += sysfs_emit_at(buf, len, "\n"); |
|
return len; |
|
} |
|
static DEVICE_ATTR(distance, 0444, node_read_distance, NULL); |
|
|
|
static struct attribute *node_dev_attrs[] = { |
|
&dev_attr_cpumap.attr, |
|
&dev_attr_cpulist.attr, |
|
&dev_attr_meminfo.attr, |
|
&dev_attr_numastat.attr, |
|
&dev_attr_distance.attr, |
|
&dev_attr_vmstat.attr, |
|
NULL |
|
}; |
|
ATTRIBUTE_GROUPS(node_dev); |
|
|
|
#ifdef CONFIG_HUGETLBFS |
|
/* |
|
* hugetlbfs per node attributes registration interface: |
|
* When/if hugetlb[fs] subsystem initializes [sometime after this module], |
|
* it will register its per node attributes for all online nodes with |
|
* memory. It will also call register_hugetlbfs_with_node(), below, to |
|
* register its attribute registration functions with this node driver. |
|
* Once these hooks have been initialized, the node driver will call into |
|
* the hugetlb module to [un]register attributes for hot-plugged nodes. |
|
*/ |
|
static node_registration_func_t __hugetlb_register_node; |
|
static node_registration_func_t __hugetlb_unregister_node; |
|
|
|
static inline bool hugetlb_register_node(struct node *node) |
|
{ |
|
if (__hugetlb_register_node && |
|
node_state(node->dev.id, N_MEMORY)) { |
|
__hugetlb_register_node(node); |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static inline void hugetlb_unregister_node(struct node *node) |
|
{ |
|
if (__hugetlb_unregister_node) |
|
__hugetlb_unregister_node(node); |
|
} |
|
|
|
void register_hugetlbfs_with_node(node_registration_func_t doregister, |
|
node_registration_func_t unregister) |
|
{ |
|
__hugetlb_register_node = doregister; |
|
__hugetlb_unregister_node = unregister; |
|
} |
|
#else |
|
static inline void hugetlb_register_node(struct node *node) {} |
|
|
|
static inline void hugetlb_unregister_node(struct node *node) {} |
|
#endif |
|
|
|
static void node_device_release(struct device *dev) |
|
{ |
|
struct node *node = to_node(dev); |
|
|
|
#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) |
|
/* |
|
* We schedule the work only when a memory section is |
|
* onlined/offlined on this node. When we come here, |
|
* all the memory on this node has been offlined, |
|
* so we won't enqueue new work to this work. |
|
* |
|
* The work is using node->node_work, so we should |
|
* flush work before freeing the memory. |
|
*/ |
|
flush_work(&node->node_work); |
|
#endif |
|
kfree(node); |
|
} |
|
|
|
/* |
|
* register_node - Setup a sysfs device for a node. |
|
* @num - Node number to use when creating the device. |
|
* |
|
* Initialize and register the node device. |
|
*/ |
|
static int register_node(struct node *node, int num) |
|
{ |
|
int error; |
|
|
|
node->dev.id = num; |
|
node->dev.bus = &node_subsys; |
|
node->dev.release = node_device_release; |
|
node->dev.groups = node_dev_groups; |
|
error = device_register(&node->dev); |
|
|
|
if (error) |
|
put_device(&node->dev); |
|
else { |
|
hugetlb_register_node(node); |
|
|
|
compaction_register_node(node); |
|
} |
|
return error; |
|
} |
|
|
|
/** |
|
* unregister_node - unregister a node device |
|
* @node: node going away |
|
* |
|
* Unregisters a node device @node. All the devices on the node must be |
|
* unregistered before calling this function. |
|
*/ |
|
void unregister_node(struct node *node) |
|
{ |
|
hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
|
node_remove_accesses(node); |
|
node_remove_caches(node); |
|
device_unregister(&node->dev); |
|
} |
|
|
|
struct node *node_devices[MAX_NUMNODES]; |
|
|
|
/* |
|
* register cpu under node |
|
*/ |
|
int register_cpu_under_node(unsigned int cpu, unsigned int nid) |
|
{ |
|
int ret; |
|
struct device *obj; |
|
|
|
if (!node_online(nid)) |
|
return 0; |
|
|
|
obj = get_cpu_device(cpu); |
|
if (!obj) |
|
return 0; |
|
|
|
ret = sysfs_create_link(&node_devices[nid]->dev.kobj, |
|
&obj->kobj, |
|
kobject_name(&obj->kobj)); |
|
if (ret) |
|
return ret; |
|
|
|
return sysfs_create_link(&obj->kobj, |
|
&node_devices[nid]->dev.kobj, |
|
kobject_name(&node_devices[nid]->dev.kobj)); |
|
} |
|
|
|
/** |
|
* register_memory_node_under_compute_node - link memory node to its compute |
|
* node for a given access class. |
|
* @mem_nid: Memory node number |
|
* @cpu_nid: Cpu node number |
|
* @access: Access class to register |
|
* |
|
* Description: |
|
* For use with platforms that may have separate memory and compute nodes. |
|
* This function will export node relationships linking which memory |
|
* initiator nodes can access memory targets at a given ranked access |
|
* class. |
|
*/ |
|
int register_memory_node_under_compute_node(unsigned int mem_nid, |
|
unsigned int cpu_nid, |
|
unsigned access) |
|
{ |
|
struct node *init_node, *targ_node; |
|
struct node_access_nodes *initiator, *target; |
|
int ret; |
|
|
|
if (!node_online(cpu_nid) || !node_online(mem_nid)) |
|
return -ENODEV; |
|
|
|
init_node = node_devices[cpu_nid]; |
|
targ_node = node_devices[mem_nid]; |
|
initiator = node_init_node_access(init_node, access); |
|
target = node_init_node_access(targ_node, access); |
|
if (!initiator || !target) |
|
return -ENOMEM; |
|
|
|
ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets", |
|
&targ_node->dev.kobj, |
|
dev_name(&targ_node->dev)); |
|
if (ret) |
|
return ret; |
|
|
|
ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators", |
|
&init_node->dev.kobj, |
|
dev_name(&init_node->dev)); |
|
if (ret) |
|
goto err; |
|
|
|
return 0; |
|
err: |
|
sysfs_remove_link_from_group(&initiator->dev.kobj, "targets", |
|
dev_name(&targ_node->dev)); |
|
return ret; |
|
} |
|
|
|
int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) |
|
{ |
|
struct device *obj; |
|
|
|
if (!node_online(nid)) |
|
return 0; |
|
|
|
obj = get_cpu_device(cpu); |
|
if (!obj) |
|
return 0; |
|
|
|
sysfs_remove_link(&node_devices[nid]->dev.kobj, |
|
kobject_name(&obj->kobj)); |
|
sysfs_remove_link(&obj->kobj, |
|
kobject_name(&node_devices[nid]->dev.kobj)); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
|
static int __ref get_nid_for_pfn(unsigned long pfn) |
|
{ |
|
if (!pfn_valid_within(pfn)) |
|
return -1; |
|
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
|
if (system_state < SYSTEM_RUNNING) |
|
return early_pfn_to_nid(pfn); |
|
#endif |
|
return pfn_to_nid(pfn); |
|
} |
|
|
|
static void do_register_memory_block_under_node(int nid, |
|
struct memory_block *mem_blk) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* If this memory block spans multiple nodes, we only indicate |
|
* the last processed node. |
|
*/ |
|
mem_blk->nid = nid; |
|
|
|
ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, |
|
&mem_blk->dev.kobj, |
|
kobject_name(&mem_blk->dev.kobj)); |
|
if (ret && ret != -EEXIST) |
|
dev_err_ratelimited(&node_devices[nid]->dev, |
|
"can't create link to %s in sysfs (%d)\n", |
|
kobject_name(&mem_blk->dev.kobj), ret); |
|
|
|
ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj, |
|
&node_devices[nid]->dev.kobj, |
|
kobject_name(&node_devices[nid]->dev.kobj)); |
|
if (ret && ret != -EEXIST) |
|
dev_err_ratelimited(&mem_blk->dev, |
|
"can't create link to %s in sysfs (%d)\n", |
|
kobject_name(&node_devices[nid]->dev.kobj), |
|
ret); |
|
} |
|
|
|
/* register memory section under specified node if it spans that node */ |
|
static int register_mem_block_under_node_early(struct memory_block *mem_blk, |
|
void *arg) |
|
{ |
|
unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE; |
|
unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); |
|
unsigned long end_pfn = start_pfn + memory_block_pfns - 1; |
|
int nid = *(int *)arg; |
|
unsigned long pfn; |
|
|
|
for (pfn = start_pfn; pfn <= end_pfn; pfn++) { |
|
int page_nid; |
|
|
|
/* |
|
* memory block could have several absent sections from start. |
|
* skip pfn range from absent section |
|
*/ |
|
if (!pfn_in_present_section(pfn)) { |
|
pfn = round_down(pfn + PAGES_PER_SECTION, |
|
PAGES_PER_SECTION) - 1; |
|
continue; |
|
} |
|
|
|
/* |
|
* We need to check if page belongs to nid only at the boot |
|
* case because node's ranges can be interleaved. |
|
*/ |
|
page_nid = get_nid_for_pfn(pfn); |
|
if (page_nid < 0) |
|
continue; |
|
if (page_nid != nid) |
|
continue; |
|
|
|
do_register_memory_block_under_node(nid, mem_blk); |
|
return 0; |
|
} |
|
/* mem section does not span the specified node */ |
|
return 0; |
|
} |
|
|
|
/* |
|
* During hotplug we know that all pages in the memory block belong to the same |
|
* node. |
|
*/ |
|
static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk, |
|
void *arg) |
|
{ |
|
int nid = *(int *)arg; |
|
|
|
do_register_memory_block_under_node(nid, mem_blk); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Unregister a memory block device under the node it spans. Memory blocks |
|
* with multiple nodes cannot be offlined and therefore also never be removed. |
|
*/ |
|
void unregister_memory_block_under_nodes(struct memory_block *mem_blk) |
|
{ |
|
if (mem_blk->nid == NUMA_NO_NODE) |
|
return; |
|
|
|
sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj, |
|
kobject_name(&mem_blk->dev.kobj)); |
|
sysfs_remove_link(&mem_blk->dev.kobj, |
|
kobject_name(&node_devices[mem_blk->nid]->dev.kobj)); |
|
} |
|
|
|
void link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn, |
|
enum meminit_context context) |
|
{ |
|
walk_memory_blocks_func_t func; |
|
|
|
if (context == MEMINIT_HOTPLUG) |
|
func = register_mem_block_under_node_hotplug; |
|
else |
|
func = register_mem_block_under_node_early; |
|
|
|
walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), |
|
(void *)&nid, func); |
|
return; |
|
} |
|
|
|
#ifdef CONFIG_HUGETLBFS |
|
/* |
|
* Handle per node hstate attribute [un]registration on transistions |
|
* to/from memoryless state. |
|
*/ |
|
static void node_hugetlb_work(struct work_struct *work) |
|
{ |
|
struct node *node = container_of(work, struct node, node_work); |
|
|
|
/* |
|
* We only get here when a node transitions to/from memoryless state. |
|
* We can detect which transition occurred by examining whether the |
|
* node has memory now. hugetlb_register_node() already check this |
|
* so we try to register the attributes. If that fails, then the |
|
* node has transitioned to memoryless, try to unregister the |
|
* attributes. |
|
*/ |
|
if (!hugetlb_register_node(node)) |
|
hugetlb_unregister_node(node); |
|
} |
|
|
|
static void init_node_hugetlb_work(int nid) |
|
{ |
|
INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); |
|
} |
|
|
|
static int node_memory_callback(struct notifier_block *self, |
|
unsigned long action, void *arg) |
|
{ |
|
struct memory_notify *mnb = arg; |
|
int nid = mnb->status_change_nid; |
|
|
|
switch (action) { |
|
case MEM_ONLINE: |
|
case MEM_OFFLINE: |
|
/* |
|
* offload per node hstate [un]registration to a work thread |
|
* when transitioning to/from memoryless state. |
|
*/ |
|
if (nid != NUMA_NO_NODE) |
|
schedule_work(&node_devices[nid]->node_work); |
|
break; |
|
|
|
case MEM_GOING_ONLINE: |
|
case MEM_GOING_OFFLINE: |
|
case MEM_CANCEL_ONLINE: |
|
case MEM_CANCEL_OFFLINE: |
|
default: |
|
break; |
|
} |
|
|
|
return NOTIFY_OK; |
|
} |
|
#endif /* CONFIG_HUGETLBFS */ |
|
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
|
|
|
#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
|
!defined(CONFIG_HUGETLBFS) |
|
static inline int node_memory_callback(struct notifier_block *self, |
|
unsigned long action, void *arg) |
|
{ |
|
return NOTIFY_OK; |
|
} |
|
|
|
static void init_node_hugetlb_work(int nid) { } |
|
|
|
#endif |
|
|
|
int __register_one_node(int nid) |
|
{ |
|
int error; |
|
int cpu; |
|
|
|
node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); |
|
if (!node_devices[nid]) |
|
return -ENOMEM; |
|
|
|
error = register_node(node_devices[nid], nid); |
|
|
|
/* link cpu under this node */ |
|
for_each_present_cpu(cpu) { |
|
if (cpu_to_node(cpu) == nid) |
|
register_cpu_under_node(cpu, nid); |
|
} |
|
|
|
INIT_LIST_HEAD(&node_devices[nid]->access_list); |
|
/* initialize work queue for memory hot plug */ |
|
init_node_hugetlb_work(nid); |
|
node_init_caches(nid); |
|
|
|
return error; |
|
} |
|
|
|
void unregister_one_node(int nid) |
|
{ |
|
if (!node_devices[nid]) |
|
return; |
|
|
|
unregister_node(node_devices[nid]); |
|
node_devices[nid] = NULL; |
|
} |
|
|
|
/* |
|
* node states attributes |
|
*/ |
|
|
|
struct node_attr { |
|
struct device_attribute attr; |
|
enum node_states state; |
|
}; |
|
|
|
static ssize_t show_node_state(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct node_attr *na = container_of(attr, struct node_attr, attr); |
|
|
|
return sysfs_emit(buf, "%*pbl\n", |
|
nodemask_pr_args(&node_states[na->state])); |
|
} |
|
|
|
#define _NODE_ATTR(name, state) \ |
|
{ __ATTR(name, 0444, show_node_state, NULL), state } |
|
|
|
static struct node_attr node_state_attr[] = { |
|
[N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), |
|
[N_ONLINE] = _NODE_ATTR(online, N_ONLINE), |
|
[N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), |
|
#ifdef CONFIG_HIGHMEM |
|
[N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
|
#endif |
|
[N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), |
|
[N_CPU] = _NODE_ATTR(has_cpu, N_CPU), |
|
[N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator, |
|
N_GENERIC_INITIATOR), |
|
}; |
|
|
|
static struct attribute *node_state_attrs[] = { |
|
&node_state_attr[N_POSSIBLE].attr.attr, |
|
&node_state_attr[N_ONLINE].attr.attr, |
|
&node_state_attr[N_NORMAL_MEMORY].attr.attr, |
|
#ifdef CONFIG_HIGHMEM |
|
&node_state_attr[N_HIGH_MEMORY].attr.attr, |
|
#endif |
|
&node_state_attr[N_MEMORY].attr.attr, |
|
&node_state_attr[N_CPU].attr.attr, |
|
&node_state_attr[N_GENERIC_INITIATOR].attr.attr, |
|
NULL |
|
}; |
|
|
|
static struct attribute_group memory_root_attr_group = { |
|
.attrs = node_state_attrs, |
|
}; |
|
|
|
static const struct attribute_group *cpu_root_attr_groups[] = { |
|
&memory_root_attr_group, |
|
NULL, |
|
}; |
|
|
|
#define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
|
static int __init register_node_type(void) |
|
{ |
|
int ret; |
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
|
BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); |
|
|
|
ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); |
|
if (!ret) { |
|
static struct notifier_block node_memory_callback_nb = { |
|
.notifier_call = node_memory_callback, |
|
.priority = NODE_CALLBACK_PRI, |
|
}; |
|
register_hotmemory_notifier(&node_memory_callback_nb); |
|
} |
|
|
|
/* |
|
* Note: we're not going to unregister the node class if we fail |
|
* to register the node state class attribute files. |
|
*/ |
|
return ret; |
|
} |
|
postcore_initcall(register_node_type);
|
|
|